ISSN:
1573-515X
Keywords:
ammonium-N
;
cattle slurry
;
NH4NO3-fertilisation
;
field experiment
;
incubation methane oxidation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Geosciences
Notes:
Abstract We have studied the inhibiting effect offertilisation and soil compaction on CH4oxidation by measuring gas fluxes and soil mineral Ndynamics in the field, and CH4 oxidation rates inlaboratory-incubated soil samples. The fertilisationand soil compaction field experiment was establishedin 1985, and the gas fluxes were measured from 1992 to1994. Methane oxidation was consistently lower infertilised than in unfertilised soil, but thereapparently was no effect of repeated fertiliseradditions on the fertilised plots. The measuredmineral N in fertilised and unfertilised soil showedlarge differences in NH4 + concentrationsjust after fertilisation, but the levels rapidlyconverged because of plant uptake and nitrification.The CH4 oxidation rate did not reflect thesecontrasting mineral N patterns, suggesting that theCH4 oxidation capacity remaining in the soil thathad been fertilised since 1985 was largely insensitiveto ammonia in the new fertiliser. Thus, competitiveinhibition by ammonia may have been involved in theearly stage of the field fertiliser experiment, butthe CH4 oxidation remaining after 7 to 9 years ofcontinued fertilisation seems not to have beenaffected by ammonia. The substrate affinity of theCH4-oxidizing microflora appeared to be the samein both the fertilised soil and the unfertilisedcontrol, as judged from the response to elevatedCH4 concentrations (52 µl l−1) inlaboratory incubations. Soil compaction resulted in apersistent reduction of CH4 influx, also seen inlaboratory incubations with sieved (4-mm mesh) soilsamples. Since the sieving presumably removesdiffusion barriers created by the soil compaction, thefact that compaction effects persisted through thesieving may indicate that soil compaction has affectedthe biological potential for CH4 oxidation in thesoil.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1006262404600
Permalink